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Author email
[email protected]
Author website
www.rickeyworld.info

Description



DS1307 is a hardware realtime clock, which works on I2C protocol. Better graphics using the same old fashioned alphanumeric LCD (type HD44780). Icons which shows the status for Alarm ON/OFF state, which gives a nice and cute look to the clock.

There are four switches connected to the uC, as shown in the figure. Function of the keys are same as clear from their names.

When the power supply is switched on it will give you the default date and time, but later you can change it to the desired value. After setting once, the backup battery will keep the clock ticking even after the power is not there.

A little about I2C:
There are basically four main conditions in I2C protocol.
1) Start Condition
2)Stop Condition
3)Data Validity
4)Acknowledgement

1)Start Condition:
when SCL is high and SDA H->L, will be taken as start condition for the communication.
2)Stop Condition:
when SCL is high and SDA L->H, will generate a stop condition.
3)Data Validity:
When SCL is high there should be no chande in SDA line only then the data is valid, the data change should be made only when SCL is low.
4)Acknowledgement:

After sending of one byte of data the reciever has to acknowledge the sender for the successful reception. for this the sender make the SDA line high and reciever pulls down the SDA low, which tells the sender that data has reached safely.

Now the source code written in assembly, basically implements the I2C protocol. the assembly source written for Keil download here clock.asm and the direct hex file for programming the controller from here clock.hex. The schematic for the Digital clock is available in PDF format can be downloaded from here clock.pdf.

Project code has been revised and updated. Bug fixes regarding corrupt display.

History:
First Upload date:
08/05/2006
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Conversation

ajay_bhargav
Mon Oct 20 2014, 11:22 AM
@skrishna, please post in forum so we can help you better.
Tue Oct 14 2014, 01:45 PM
skrishna
how do i write an ALP equivalent 7segment display interfacing embedded c program (both 8051 microcontroller)
Sat Oct 11 2014, 06:41 PM
vaidehi
want details of seven segment LED display common cathode ( IC CD 4026)
Fri Oct 03 2014, 12:52 PM
Narsim
Rickey you inspired me a lot ... I am also planing like you ...
ExperimenterUK
Wed Oct 01 2014, 09:33 PM
We're back.. we had a bug, but posting is back to normal
ExperimenterUK
Sat Sep 13 2014, 04:34 PM
jaimin1212,Pimpalkhare Create a thread for your question
jaimin1212
Sat Sep 13 2014, 06:35 AM
i want to make self balancing robot using MPU6050 using atmega8.. please help to get data of gyro and accelerometer from this sensor through atmega8.
Thu Sep 11 2014, 01:00 PM
Sunil Pimpalkhare
Hello sir, I am trying to make Wearfin project https://www.youtube.com/watch?v=iZ6PVBvQf-g so can u help me in teaching how to built the program???
Thu Sep 11 2014, 06:21 AM
hariom panday
plz hlp me in my project
iec.naga
Tue Sep 09 2014, 05:19 AM
spi

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hiswe
Thu Oct 23 2014, 04:18 PM
pddung93
Sun Oct 19 2014, 01:56 PM
msideal
Thu Oct 16 2014, 08:48 AM
robotgirl
Tue Oct 14 2014, 06:23 PM
BRV64
Mon Oct 13 2014, 05:48 AM
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Sun Oct 12 2014, 12:20 PM
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ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Oct 24 2014, 08:55 PM
Try holding STB high all the time.You might as wel...
msideal Avatar
Posted By msideal
Fri Oct 24 2014, 07:14 PM
Assembly Language Code:.INCLUDE "M16DEF.INC" LDI R...
msideal Avatar
Posted By msideal
Fri Oct 24 2014, 07:12 PM
Hi Friends,I changed my approach and now i'm using...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Oct 22 2014, 03:22 AM
Okay, it seems to be a simple serial connection.Th...
jona Avatar
Posted By jona
Tue Oct 21 2014, 10:29 PM
I found this slightly different data sheet on a pu...
majoka Avatar
Posted By majoka
Tue Oct 21 2014, 06:35 PM
after this Accept-language:en-us\r\n...
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Posted By majoka
Tue Oct 21 2014, 06:33 PM
@ aksharAT89C51AC3 can bebut the final decision wi...
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Posted By majoka
Tue Oct 21 2014, 06:29 PM
@ Okechukwubefore starting this project you should...
majoka Avatar
Posted By majoka
Tue Oct 21 2014, 06:18 PM
@ kirangowleyou have to set the microphone level a...